If some of the dark black/greywash shading is TOO dark in the finished tattoo.........One option is to go to a different artist who knows what he's doing.....and have him go over the too-dark areas with nothing more than a dry needle...No-Ink or water....If done correctly (and slowly)...the bare needle can actually break the skin and 'pull out' some of the extra ink......lightening it up wherever needed.